Structural defects of superconducting core of the single fiber MgB2/Nb,Cu composite

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Abstract

The microstructure of the MgB2 core of the single fiber composite consisting of MgB2, the Nb barrier, and the Cu shell (MgB2/Nb,Cu), which is synthesized by the powder-in-tube method with an ex situ option and by subsequent annealing, has been studied. It is shown that a dislocation microstructure that exhibits high thermal stability is formed in the MgB2 core during cold deformation, in addition to powder compaction. A high dislocation density is observed inside MgB2 grains. Dislocations form walls with small misorientation angles between subgrains. Annealing at a temperature of 900°C for 1 h leads to a higher density of MgB2 ceramics, and the intergranular contact area increases. Moreover, MgO inclusions with a size of 10 nm or less are formed. Thus, various kinds of structural defects are formed, which can be considered as probable pinning centers for the magnetic flux.

About the authors

E. I. Kuznetsova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Author for correspondence.
Email: monocrist@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

T. P. Krinitsina

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: monocrist@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

Yu. V. Blinova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: monocrist@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

M. V. Degtyarev

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: monocrist@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

P. V. Konovalov

AO VNIINM

Email: monocrist@imp.uran.ru
Russian Federation, Moscow, 123098

K. K. Dikhtiyevskaya

AO VNIINM

Email: monocrist@imp.uran.ru
Russian Federation, Moscow, 123098

I. M. Abdyukhanov

AO VNIINM

Email: monocrist@imp.uran.ru
Russian Federation, Moscow, 123098

A. S. Tsapleva

AO VNIINM

Email: monocrist@imp.uran.ru
Russian Federation, Moscow, 123098

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